The Rare Earth pickup has been carefully re-voiced and fine-tuned to offer an even smoother treble response than their popular, category-defining predecessors. Fits soundholes as small as 3 5/8” (92 mm) diameter. The pickup has active electronics and neodymium magnet structure for exceptional string balance and sparkling acoustic clarity. It's low-current design of the preamp gives you up to 240 hours between battery changes! The pre-wired output jack can also be endpin mounted!